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"""Tests of grpc.reflection.v1alpha.reflection."""

import unittest

import grpc
from grpc.framework.foundation import logging_pool
from grpc.reflection.v1alpha import reflection
from grpc.reflection.v1alpha import reflection_pb2

from google.protobuf import descriptor_pool
from google.protobuf import descriptor_pb2

from src.proto.grpc.testing.proto2 import empty2_extensions_pb2
from src.proto.grpc.testing import empty_pb2
from tests.unit.framework.common import test_constants

_EMPTY_PROTO_FILE_NAME = 'src/proto/grpc/testing/empty.proto'
_EMPTY_PROTO_SYMBOL_NAME = 'grpc.testing.Empty'
_SERVICE_NAMES = (
    'Angstrom', 'Bohr', 'Curie', 'Dyson', 'Einstein', 'Feynman', 'Galilei')

def _file_descriptor_to_proto(descriptor):
  proto = descriptor_pb2.FileDescriptorProto()
  descriptor.CopyToProto(proto)
  return proto.SerializeToString()

class ReflectionServicerTest(unittest.TestCase):

  def setUp(self):
    servicer = reflection.ReflectionServicer(service_names=_SERVICE_NAMES)
    server_pool = logging_pool.pool(test_constants.THREAD_CONCURRENCY)
    self._server = grpc.server(server_pool)
    port = self._server.add_insecure_port('[::]:0')
    reflection_pb2.add_ServerReflectionServicer_to_server(servicer, self._server)
    self._server.start()

    channel = grpc.insecure_channel('localhost:%d' % port)
    self._stub = reflection_pb2.ServerReflectionStub(channel)

  def testFileByName(self):
    requests = (
      reflection_pb2.ServerReflectionRequest(
        file_by_filename=_EMPTY_PROTO_FILE_NAME
      ),
      reflection_pb2.ServerReflectionRequest(
        file_by_filename='i-donut-exist'
      ),
    )
    responses = tuple(self._stub.ServerReflectionInfo(requests))
    expected_responses = (
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        file_descriptor_response=reflection_pb2.FileDescriptorResponse(
          file_descriptor_proto=(
            _file_descriptor_to_proto(empty_pb2.DESCRIPTOR),
          )
        )
      ),
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        error_response=reflection_pb2.ErrorResponse(
          error_code=grpc.StatusCode.NOT_FOUND.value[0],
          error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
        )
      ),
    )
    self.assertEqual(expected_responses, responses)

  def testFileBySymbol(self):
    requests = (
      reflection_pb2.ServerReflectionRequest(
        file_containing_symbol=_EMPTY_PROTO_SYMBOL_NAME
      ),
      reflection_pb2.ServerReflectionRequest(
        file_containing_symbol='i.donut.exist.co.uk.org.net.me.name.foo'
      ),
    )
    responses = tuple(self._stub.ServerReflectionInfo(requests))
    expected_responses = (
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        file_descriptor_response=reflection_pb2.FileDescriptorResponse(
          file_descriptor_proto=(
            _file_descriptor_to_proto(empty_pb2.DESCRIPTOR),
          )
        )
      ),
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        error_response=reflection_pb2.ErrorResponse(
          error_code=grpc.StatusCode.NOT_FOUND.value[0],
          error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
        )
      ),
    )
    self.assertEqual(expected_responses, responses)

  @unittest.skip('TODO(atash): implement file-containing-extension reflection '
                 '(see https://github.com/google/protobuf/issues/2248)')
  def testFileContainingExtension(self):
    requests = (
      reflection_pb2.ServerReflectionRequest(
        file_containing_extension=reflection_pb2.ExtensionRequest(
          containing_type='grpc.testing.proto2.Empty',
          extension_number=125,
        ),
      ),
      reflection_pb2.ServerReflectionRequest(
        file_containing_extension=reflection_pb2.ExtensionRequest(
          containing_type='i.donut.exist.co.uk.org.net.me.name.foo',
          extension_number=55,
        ),
      ),
    )
    responses = tuple(self._stub.ServerReflectionInfo(requests))
    expected_responses = (
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        file_descriptor_response=reflection_pb2.FileDescriptorResponse(
          file_descriptor_proto=(
            _file_descriptor_to_proto(empty_extensions_pb2.DESCRIPTOR),
          )
        )
      ),
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        error_response=reflection_pb2.ErrorResponse(
          error_code=grpc.StatusCode.NOT_FOUND.value[0],
          error_message=grpc.StatusCode.NOT_FOUND.value[1].encode(),
        )
      ),
    )
    self.assertEqual(expected_responses, responses)

  def testListServices(self):
    requests = (
      reflection_pb2.ServerReflectionRequest(
        list_services='',
      ),
    )
    responses = tuple(self._stub.ServerReflectionInfo(requests))
    expected_responses = (
      reflection_pb2.ServerReflectionResponse(
        valid_host='',
        list_services_response=reflection_pb2.ListServiceResponse(
          service=tuple(
            reflection_pb2.ServiceResponse(name=name)
            for name in _SERVICE_NAMES
          )
        )
      ),
    )
    self.assertEqual(expected_responses, responses)

if __name__ == '__main__':
  unittest.main(verbosity=2)
